views = 500
likes = 380
if views > 350:
    if likes >= 300:
        print('视频比较受欢迎，且观众认可度较高')
    else:
        print('视频比较受欢迎，但观众认可度不高')
else:
    print('观众对此类视频不感兴趣')


for i in range(4):
    if i % 2 == 0:
        print(i, '是偶数')
    else:
        print(i, '是奇数')

n = 1
sum = 0
while n <= 100:
    if n % 2 == 0:
       sum += n
    n += 1
print('1～100范围内的所有偶数之和为：', sum)
